@misc{indiciaec4023f1a43ea,
  title = {Sick sinus syndrome.},
  author = {B Livesley},
  year = {1973},
  doi = {10.1136/bmj.3.5872.174},
  url = {https://pubmed.ncbi.nlm.nih.gov/4720778/},
  note = {Source identifier: 4720778}
}